HttpConnection no emulador ok, no Nokia 6060 dá erro

import java.io.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class Principal extends MIDlet implements CommandListener {
    
    private Display display;
    private String url = "http://www.market.com.br/junior/enquete.php?usuario=";
    private Form f;
    private TextField userField, respostaField;
    private Command consultarCommand;
    
    public Principal() {
        display = Display.getDisplay(this);
        
        // monta fields
        userField     = new TextField("Usuário" , "Junior", 20, TextField.ANY);
        respostaField = new TextField("Resposta", "", 20, TextField.ANY);
        
        // monta form
        f = new Form("Teste de HTTP");
        f.append(userField);
        f.append(respostaField);
        
        // comando
        consultarCommand = new Command("Consultar", Command.SCREEN, 1);
        f.addCommand(consultarCommand);
        f.setCommandListener(this);
        
        // form é o display atual
        display.setCurrent(f);
    }
    
    public void commandAction(Command command, Displayable displayable) {
        
        if (command == consultarCommand) {
            String usuario = userField.getString().toLowerCase();
            
            try {
                testGET(url + usuario);
            } catch (IOException e) {
                System.out.println("IOException " + e);
                e.printStackTrace();
            }
        }
    }
    
    void testGET(String url) throws IOException {
        
        HttpConnection connection = null;
        InputStream is = null;
        OutputStream os = null;
        StringBuffer stringBuffer = new StringBuffer();
        
        try {
            
            connection = (HttpConnection)Connector.open(url);
            
            os = connection.openOutputStream();
            is = connection.openDataInputStream();
            
            int ch;
            while ((ch = is.read()) != -1) {
                stringBuffer.append((char) ch);
            }
            
            respostaField.setString(stringBuffer.toString());
        } catch (Exception e) {
            
            String x = e.toString();
            respostaField.setString(x);
            
            
        } finally {
            
            if(is!= null) {
                is.close();
            }
            
            if(os != null) {
                os.close();
            }
            
            if(connection != null) {
                connection.close();
            }
        }
    }
    
    private void mostra(String a) {
        Alert alerta = new Alert("Atenção", a, null, AlertType.INFO);
        alerta.setTimeout(10000);
        display.setCurrent(alerta);
    }
    
    public void startApp() {    }
    public void pauseApp() {    }
    public void destroyApp(boolean unconditional) {   }
}